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The key to improve the photovoltaic performance of perovskite solar cells is the quality of perovskite materials. Here, we report a growth mode that the perovskite precursor film is thermal annealed in mixed anti-solvent (IPA) and solvent (DMF) (100:1, v/v) vapor environment to improve the film quality, which enhances the power conversion efficiency of CH3NH3PbI3 based planar heterojunction solar...
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